Julianna Murphy, of Penfield, New York, Stephen Cerrone, of Quechee, Vermont, Lukas Kaminski, of Hopkinton, all 19, and 18-year-old Molly Hines of Penfield, New York, were arrested for disorderly conduct during July 4 celebrations, reports Cape Cod Times.

Kaminski, who was not in the water at the time, was reportedly arrested for disobeying police orders to vacate the area.

An unidentified 17-year-old boy is also said to have taken part in the sexual activity, though it is unclear if he was arrested.

People on the beach were filming the whole thing (Picture: Twitter)

The crowd cheered: ‘USA! USA! USA!’ (Picture: Twitter)

The alarm was raised just after midday by a beach monitor who got in touch with police.

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According to the news website, Dennis Detective Matthew Turner wrote in a report: ‘I could not observe exactly what was going on, however both couple(s) were extremely closely embraced. Each embraced couple were at a minimum kissing and stumbling about in the waves.’

The group was spotted around 100 feet from the shore.

Beach-goers everywhere — including children — were allegedly watching the scene unfold.

Four people were spotted fooling around in the water off Mayflower Beach (Picture: Twitter)

They appeared in court this week (Picture: Twitter)

Turner tried to stop what was going on by shouting over to the group. Eventually, after multiple whistles from a lifeguard, they were escorted out from the bay.

The detective said it became clear that all four teenagers had been drinking.

Ten more officers had to come deal with the incident and calm down a rowdy crowd.

Dennis police Lt. Peter Benson said: ‘During the daytime hours at the height of Fourth of July, something like this is kind of rare.